Image processing for a Portable Image Viewer: Optimization of Gray-scale manipulation

我们认为，合适的显示系统是用于便携式诊断观察设备的LCD设备。比较CRT显示器与LCD显示器的差异，并以ROC曲线分析LCD显示器的效能。我们准备了50个正常的胸部X线图像和50个异常的胸部X线图像与人工硬币病变。在评估图像之前，我们将图像处理成灰度操作。我们使用的图像处理方法是感知线性方法。我们观察了两种显示系统（CRT显示器和LCD设备）中的图像。10名放射科医师评价了每个显示系统上硬币病变的存在。他标记了每个CRT和LCD图像的硬币病变的概率。一个图像的诊断时间限制为30秒。进行ROC曲线分析。LCD和CRT的曲线下面积分别为0.899和0.918。两种显示系统间差异无统计学意义，但CRT显示器的曲线下面积略优于LCD显示器。LCD设备在显示X射线图像时可能存在一些问题，我们可以将LCD系统用于临床实践，未来我们认为LCD系统是便携式诊断图像显示器中CRT显示器的替代品。

We think that the suitable display system is a LCD device for a portable diagnostic viewing device. We examined the difference between the CRT display and the LCD device.To analyze the effectiveness of the LCD device, we performed the ROC curve analysis. We prepared the normal 50 chest X-ray images and the abnormal 50 chest X-ray images with an artificial coin lesion. Before evaluating images, we processed images into the grayscale manipulation. The image processing method we used was the perception linear method. We observed the images in both display system (CRT display and LCD device). Ten radiologist evaluated existence of the coin lesion on each display system. He marked the probability of the coin lesion each CRT and LCD images. The diagnostic time for one image was limited to 30 seconds. The analysis of ROC curve was performed. The are under curve was 0.899 for LCD and 0.918 for CRT. There were no statistic significances among two display systems/ But the area under curve of CRT display was slightly better than one of LCD. The LCD device might have some problems in displaying X-ray images, we could use the LCD system for clinical practice.In future we think that the LCD system is alternative to CRT display in a portable diagnostic image display.